Need a lens recommendation for product photography. I will hopefully be getting a Canon 5D at work to shoot our products. I have been using my 20D and mostly the 24-70L. Was thinking of getting this lens for the 5D at work as well since it has worked rather well. The room we shoot our photos in is rather small. Maybe only about 18 feet in length, and about 6 feet of that is used for the table we have set up on which we set up our product. So mostly I will have about a maximum of 12 ft to work with when shooting the product. What lens do you think would work best with a 5D for this type of work?